/*
    * This file is part of Waarp Project (named also Waarp or GG).
    *
    *  Copyright (c) 2019, Waarp SAS, and individual contributors by the @author
    *  tags. See the COPYRIGHT.txt in the distribution for a full listing of
    * individual contributors.
    *
    *  All Waarp Project is free software: you can redistribute it and/or
    * modify it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or (at your
   * option) any later version.
   *
   * Waarp is distributed in the hope that it will be useful, but WITHOUT ANY
   * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License along with
   * Waarp . If not, see <http://www.gnu.org/licenses/>.
   */
  package org.waarp.ftp.core.command.directory;
  
  import org.waarp.common.command.ReplyCode;
  import org.waarp.common.command.exception.CommandAbstractException;
  import org.waarp.common.command.exception.Reply530Exception;
  import org.waarp.common.logging.WaarpLogger;
  import org.waarp.common.logging.WaarpLoggerFactory;
  import org.waarp.ftp.core.command.AbstractCommand;
  import org.waarp.ftp.core.file.FtpDir;
  
  /**
   * CWD command
   */
  public class CWD extends AbstractCommand {
    /**
     * Internal Logger
     */
    private static final WaarpLogger logger =
        WaarpLoggerFactory.getLogger(CWD.class);
  
    @Override
    public final void exec() throws CommandAbstractException {
      final FtpDir current = getSession().getDir();
      if (current == null) {
        logger.warn("not identidied");
        throw new Reply530Exception("Not authentificated");
      }
      String nextDir = getArg();
      if (!hasArg()) {
        nextDir = "/";
      }
      if (current.changeDirectory(nextDir)) {
        getSession().setReplyCode(ReplyCode.REPLY_250_REQUESTED_FILE_ACTION_OKAY,
                                  '"' + current.getPwd() +
                                  "\" is the new current directory");
      } else {
        getSession().setReplyCode(ReplyCode.REPLY_550_REQUESTED_ACTION_NOT_TAKEN,
                                  null);
      }
    }
  
  }